Northern Telecom DMS-100 Series Installation And Maintenance Manual page 97

0
0
0 To Perform a Far-end Loopback Test:
0 1. Press the Settings key.
0 2. Press the Alternate key.
0 3. Press the 0 on the numeric keypad until the Far-end
0 LED lights.
0 4. Press the
0 Under Test LED lights.
0 5. Setup a call to another DU.
0 6. Type a string of characters on the
0 typed characters are echoed back to the terminal, the end-to-
0 end data channel is good.
0 7. Take down the call.
0 8. Press the Settings key.
0 9. Press the 0 on the numeric keypad until none of the Loopback
0 LEDs are lit.
0 10. Press the Settings key.
0 turn off.
0 11. Press the Alternate key.
0 To Perform a Far-end Loopback Test:
0 1. Press the Settings key.
0 2. Press the Alternate key.
0 3. Press the 4 on the numeric keypad until the Far-end Loop LED
0 is lit.
0 4. Press the Settings key again.
0 the Under Test LED lights.
0 5. Setup a call to another DU.
0 6. Make sure the DTE power is on, then type a string of
0 ters on the DTE keyboard.
0 back to the terminal, the end-to-end connection is good.
0 7. Take down the call.
0 8. Press the Settings key.
0 9. Press the 4 on the numeric keypad.
0 turns off.
0
The Settings LED lights.
The Alternate LED lights.
Settings key. The Settings LED turns off and the
The Settings LED lights.
The Settings and
The Alternate LED turns off.
The Settings LED lights.
The Alternate LED lights.
If the typed characters are echoed
The Settings LED lights.
VINTAGE 05.01
(NT4X25AF /AH)
DTE keyboard.
Under
(NT4X25AG /AK)
The Settings LED turns off and
The Far-end Loopback LED
297-2121-226
Loopback
If the
Test LEDs
charac-
5-7